Abstract: A garment hanger security device for a garment hanger having a suspension hook wherein a strong flexible member such as a chain or cord is provided having connection means at both ends thereof to the hanger, the flexible member being of a length to pass from one end to the other from the hanger through at least part of a garment such as a sleeve of the latter when the garment is hung on the hanger; locking means being further provided for effecting releasable connection of at least one of said ends of the flexible member to the hanger whereby retention of the garment relative to the hanger and a rail supporting the latter can be obtained. One end of the flexible member is preferably securely connected to the free end of the suspension hook of the hanger.